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. 2015 Jun 12;114(23):231302.
doi: 10.1103/PhysRevLett.114.231302. Epub 2015 Jun 11.

Dark Matter Search Results from the PICO-2L C3F8 Bubble Chamber

C Amole  1 , M Ardid  2 , D M Asner  3 , D Baxter  4 , E Behnke  5 , P Bhattacharjee  6 , H Borsodi  5 , M Bou-Cabo  2 , S J Brice  7 , D Broemmelsiek  7 , K Clark  8 , J I Collar  9 , P S Cooper  7 , M Crisler  7 , C E Dahl  4   7 , S Daley  1 , M Das  6 , F Debris  10 , N Dhungana  11 , J Farine  11 , I Felis  2 , R Filgas  12 , M Fines-Neuschild  10 , F Girard  10 , G Giroux  1 , M Hai  9 , J Hall  3 , O Harris  5 , C M Jackson  10 , M Jin  4 , C B Krauss  13 , M Lafrenière  10 , M Laurin  10 , I Lawson  11   14 , I Levine  5 , W H Lippincott  7 , E Mann  5 , J P Martin  10 , D Maurya  15 , P Mitra  13 , R Neilson  9   16 , A J Noble  1 , A Plante  10 , R B Podviianiuk  11 , S Priya  15 , A E Robinson  9 , M Ruschman  7 , O Scallon  10   11 , S Seth  6 , A Sonnenschein  7 , N Starinski  10 , I Štekl  12 , E Vázquez-Jáuregui  11   14   17 , J Wells  5 , U Wichoski  11 , V Zacek  10 , J Zhang  4 ; PICO Collaboration
Affiliations

Dark Matter Search Results from the PICO-2L C3F8 Bubble Chamber

C Amole et al. Phys Rev Lett. .

Abstract

New data are reported from the operation of a 2 liter C3F8 bubble chamber in the SNOLAB underground laboratory, with a total exposure of 211.5 kg days at four different energy thresholds below 10 keV. These data show that C3F8 provides excellent electron-recoil and alpha rejection capabilities at very low thresholds. The chamber exhibits an electron-recoil sensitivity of <3.5×10(-10) and an alpha rejection factor of >98.2%. These data also include the first observation of a dependence of acoustic signal on alpha energy. Twelve single nuclear recoil event candidates were observed during the run. The candidate events exhibit timing characteristics that are not consistent with the hypothesis of a uniform time distribution, and no evidence for a dark matter signal is claimed. These data provide the most sensitive direct detection constraints on WIMP-proton spin-dependent scattering to date, with significant sensitivity at low WIMP masses for spin-independent WIMP-nucleon scattering.

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